Browsing by Author "Pelozo, Gisela Guadalupe"

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    Ceramic bricks using pistachio shells as controlled porosity former
    (University Amar Telidji - Laghouat, 2023-03-27) Quaranta, Nancy Esther; Caligaris, Marta Graciela; Unsen, Miguel Angel; López, Hugo Arbelio; Pelozo, Gisela Guadalupe; Cristóbal, Adrián Alberto
    The present work studies the use of pistachio shells as a porosity-forming raw material in the manufacture of ceramic bricks. It focuses on the characteristics of the ceramic pieces obtained with different residual biomass contents (from 5 to 20% by volume). The specimens were shaped by uniaxial pressure of 25 MPa, and then were treated at 950°C for 3h. Based on the results obtained it is possible to conclude that the use of this residual biomass, as a pore former in the ceramic industry is feasible. The proportion of added biomass that generates the best characteristics and properties in the final product is 10%. Up to this percentage of aggregate, ceramic pieces with very good macroscopic and microscopic characteristics are obtained, with porosity and flexural strength values that meet market requirements for this type of product. Optical microscopy technique has been used to carry out a detailed analysis of the shape and size of the formed pores, which is a specific objective of this work. It has been observed that for contents of 5 and 10% biomass, the shape of pores is similar to the shape of the particles of added pistachio shells, while for higher contents (15 and 20%) it is different with elongated characteristics. In relation with the size of the pores, at lower contents is around 60% of the original particles size, and for the higher percentages of biomass, they are larger, indicating that agglomerates of particles are formed and when combusted, produce that porosity characteristics.
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    Ceramic matrices for immobilization of heavy metals adsorbed on rice husk
    (2020-04-25) Romano, Melisa Soledad; Pelozo, Gisela Guadalupe; Quaranta, Nancy Esther; Corne, Valeria; García, María del Carmen
    Numerous studies have been conducted about the removal of heavy metal ions from aqueous solutions using lignocellulosic materials, which are capable of adsorbing various contaminants present even at low concentrations. Rice husk constitutes biomass waste that has found multiple applications in diferent felds, such as the removal of heavy metals by adsorption. After this process, a biomass-contaminant waste is generated, which currently does not have viable and low-cost alternatives for its fnal disposal. Thus, the objective of this work is to evaluate the possibility of incorporating rice husk contaminated with Cu–Ni–Cd and Pb–Zn into ceramic matrices, to immobilize these hazardous metals. Ceramic pieces from mixtures of commercial clay and rice husk with adsorbed metal, added by 10% in volume were obtained. The raw materials were characterized by diferent techniques, such as SEM-EDS, XRD, DTA-TGA, particle size distribution, ecotoxicity, etc., while in ceramic products were analysed porosity, permanent volumetric variation, weight loss of ignition, ecotoxicity, among others. From the overall results, it is possible to conclude that the obtained ceramic pieces have immobilized within their structure, the heavy metals present on rice husk. The bricks have excellent physical and mechanical properties that make possible their use in civil construction.
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    Effect of the incorporation of biomass wastes on the properties of fired clay bricks
    (2018-11-11) Pelozo, Gisela Guadalupe; Quaranta, Nancy Esther; Caligaris, Marta Graciela; Romano, Melisa Soledad; Cristóbal, Adrián Alberto
    In this work, the feasibility of reusing two biomass wastes: sunflower shells and rice husks is analyzed through their incorporation in clay mixtures for the production of porous ceramic materials. For this purpose, the raw materials were first characterized by different techniques. The ceramic pieces were obtained by means of uniaxial pressure at 25 MPa of commercial clay-biomass waste mixtures, the latter added in 10% by volume. After a drying period, they were thermally treated at 1000°C following firing curves similar to those used by the ceramic industry. The products obtained were characterized by various techniques: porosity, permanent volumetric variation, weight loss on ignition, mechanical properties, among others. The ceramic products obtained present homogeneous tonality, well-defined edges and angles, without shelling of the structure. The results of the porosity test show that the waste aggregates increase this property in the ceramic materials studied.
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    Inmovilización de metales pesados adsorbidos sobre cáscara de arroz en matrices cerámicas
    (2018-10-01) Pelozo, Gisela Guadalupe; Quaranta, Nancy Esther; Romano, Melisa Soledad; García, María del Carmen; Bertetti, Yamila Belén; Robles, Victoria Evangelina
    El objetivo de este trabajo es analizar la factibilidad de incorporación de cáscara de arroz con metales pesados adsorbidos, en matrices cerámicas arcillosas para inmovilizar los metales cadmio y plomo contenidos. Las piezas cerámicas se obtuvieron mediante presión uniaxial a 25MPa de mezclas arcilla comercial-cáscaras de arroz con y sin metal adsorbido, adicionado en 10%, tratadas térmicamente a 1000°C. Las materias primas y los productos compactos obtenidos se caracterizaron mediante diversas técnicas de caracterización. Las piezas cerámicas obtenidas presentan tonalidad homogénea, bordes y ángulos bien definidos, sin desgranamiento de la estructura, y propiedades mecánicas adecuadas a su uso en servicio.
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    Matrices arcillosas como herramienta de fijación de metales pesados adsorbidos sobre cáscara de arroz
    (2019-08-04) Romano, Melisa Soledad; Pelozo, Gisela Guadalupe; Quaranta, Nancy Esther; Corne, Valeria; García, María del Carmen
    La descarga de metales pesados tóxicos al ambiente a partir de actividades industriales causa numerosos problemas debido a sus características perjudiciales para la salud y el ambiente. En los últimos años, se han realizado numerosos estudios basados en la eliminación de iones de metales pesados de soluciones acuosas utilizando materiales lignocelulósicos, que son capaces de adsorber diversos contaminantes incluso presentes a bajas concentraciones. La cáscara de arroz constituye un residuo de biomasa que se ha estudiado en diversas aplicaciones. En años recientes se ha utilizado en procesos de biosorción de metales pesados. Después de este proceso, se genera un residuo biomasa contaminante, que actualmente no tiene alternativas viables de bajo costo para su disposición final segura. El objetivo de este trabajo es evaluar la viabilidad de la incorporación a matrices cerámicas, de cáscara de arroz contaminada con Cu-Ni-Cd y Pb Zn, con el fin de inmovilizar dichos metales esados. Las piezas cerámicas se obtuvieron a partir de mezclas de arcilla comercial y cáscara de arroz con metal adsorbido, añadidas en un 10 % en volumen. Las materias primas (cáscara y arcilla) fueron caracterizadas por SEM-EDS, distribución granulométrica, ecotoxicidad, etc., mientras que los productos cerámicos obtenidos se caracterizaron con técnicas tales como: porosidad, variación volumétrica permanente, pérdida de peso por calcinación, ecotoxicidad, entre otros. Del análisis de los resultados, se puede concluir que las piezas cerámicas obtenidas han inmovilizado dentro de su estructura los metales pesados contenidos en la cáscara de arroz agregada.